A former orichalcum-ranked adventurer, Lockmyer joined Marquis Raeven's private force consisting of veteran adventurers. He and his team were pretty famous and admired in their time, even now people like Gazef recognise them and respect their abilities.

During the suppression operation against Eight Fingers, Lockmyer teams up with Climb and Brain Unglaus. During the reconnaissance, he finds out that all of Six Arms are gathered at their destination. Fortunately, Sebas Tian joins them, allowing them to get inside and rescue Tsuare rather than fighting. While Sebas kills four of Six Arms without injuries, Lockmyer, Climb and Brain Unglaus encounters Zero and Succulent. Lockmyer is badly wounded by Zero's attack, but overcomes the crisis by the help of a healing potion. He later supports Climb to defeat Succulent.

After the appearance of Jaldabaoth, Lockmyer volunteers to help Climb and Brain even though he knows that their mission is extremely dangerous. Fortunately, he returns safely after the mission.

As one of Marquis Raeven's private troop, Lockmyer alongside with his comrades joined the annual war at Katze Plains. During the Massacre, Lockmyer alongside with his comrades tried to buy time for Marquis Raeven to escape but he and the rest of his comrades were all killed by the Dark Young.

Lockmyer teams up with Climb during the suppression operation. Later he volunteers himself to help him again during the events of the Demonic Disturbance. Climb reminds him of his younger days. He respects his decisions and thinks no one has the right to force him off from his path.

(To Brain about Climb): "How shall I put it seeing a kid like him fight so hard made me remember the days when I was still young, even if it was just for a while. I think I understand how you feel about this too. Even so it was the path he chose. We have no right to force him off it."